By Adam Green, Matthew Geller
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Extra info for Apple Pro Training Series: Xsan Quick-Reference Guide
Because of the number of Fibre cables in this topology (32 total), an additional switch has been implemented. Data cascades effortlessly between the two switches because a high-bandwidth interswitch link (ISL) has been made with six user ports on each switch. Think of it as a data river that flows bidirectionally between each switch. A primary and a standby MDC are mandatory with such a large implementation. To keep their roles simple and efficient, the directory is implemented on the outer network.
Storage • 4 x Xserve RAID 7 TB (populated with six 500 GB drive modules per controller; the seventh is a hot spare, not used in the storage calculation) • 512 MB cache per controller (1 GB total) Fibre Channel Switch • 2 x Apple qualified Fibre Channel switch Metadata Controllers • Xserve, Xserve G5, or Xserve G5 cluster node • 1 GB RAM per controller Lesson 4. Setting Up Your Storage The Apple Xserve RAID (redundant array of independent disks) is a group of hard drives that appears to the host Power Mac as a single high-speed storage unit.
Striping divides a logical drive into data blocks, or stripes, that are distributed across an array of physical drives. Striping a set of disks improves storage performance because each drive operates concurrently. However, striping alone, known as RAID level 0, offers no data protection. Mirroring involves writing identical copies of all data to a pair of physical drives. This results in very high data reliability; if one drive fails, the data is still available on the remaining drive. However, it also results in a storage efficiency of only 50 percent, because two physical drives are required to achieve a single drive's capacity.
Apple Pro Training Series: Xsan Quick-Reference Guide by Adam Green, Matthew Geller